Numerical Investigation of Flow around Two Tandem Cylinders in the Upper Transition Reynolds Number Regime Using Modal Analysis

被引:5
|
作者
Nazvanova, Anastasiia [1 ]
Yin, Guang [1 ]
Ong, Muk Chen [1 ]
机构
[1] Univ Stavanger, Dept Mech & Struct Engn & Mat Sci, N-4036 Stavanger, Norway
关键词
tandem cylinders; high Reynolds number flow; Dynamic Mode Decomposition; CIRCULAR-CYLINDER; RECTANGULAR CYLINDERS; SPECTRAL-ANALYSIS; DECOMPOSITION; SIMULATION; WAKE;
D O I
10.3390/jmse10101501
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
Flow around two tandem cylinders at Re = 3.6 x 10(6) for different center-to-center spacing ratio (L/D) is investigated numerically using two-dimensional (2D) Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations combined with a standard k-omega SST turbulence model. The instantaneous flow structures around the cylinders, hydrodynamic forces on the cylinders and Strouhal number (St) are analyzed and discussed. Dynamic Mode Decomposition (DMD) is used to extract the spatiotemporal information of the coherent flow structures in the wake regions behind the upstream (UC) and downstream (DC) cylinders. A sparsity-promoted algorithm is implemented to select the dominant modes which contribute the most to the dynamics of the system. Based on the dominant modes, a reduced-order representation of the flows is built. A comparison of the lift and drag force-time histories, obtained by simulation results and the reduced-order representations, shows a high capability of the latter to reproduce the surrounding flow and hydrodynamic properties of the tandem cylinders at the high Reynolds number.
引用
收藏
页数:25
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